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Simplifying -28 = -7(3x + 4) + 216 Reorder the terms: -28 = -7(4 + 3x) + 216 -28 = (4 * -7 + 3x * -7) + 216 -28 = (-28 + -21x) + 216 Reorder the terms: -28 = -28 + 216 + -21x Combine like terms: -28 + 216 = 188 -28 = 188 + -21x Solving -28 = 188 + -21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21x' to each side of the equation. -28 + 21x = 188 + -21x + 21x Combine like terms: -21x + 21x = 0 -28 + 21x = 188 + 0 -28 + 21x = 188 Add '28' to each side of the equation. -28 + 28 + 21x = 188 + 28 Combine like terms: -28 + 28 = 0 0 + 21x = 188 + 28 21x = 188 + 28 Combine like terms: 188 + 28 = 216 21x = 216 Divide each side by '21'. x = 10.28571429 Simplifying x = 10.28571429
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